CN104752840B - A kind of Terahertz broadband random surface - Google Patents
A kind of Terahertz broadband random surface Download PDFInfo
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- CN104752840B CN104752840B CN201510164584.0A CN201510164584A CN104752840B CN 104752840 B CN104752840 B CN 104752840B CN 201510164584 A CN201510164584 A CN 201510164584A CN 104752840 B CN104752840 B CN 104752840B
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Abstract
The invention discloses a kind of Terahertz broadband random surface, including metal patch layer, dielectric layer and metal floor layer；The dielectric layer is located between metal patch layer and metal floor layer, and dielectric layer is polyimides or other organic high molecular polymer dielectric materials, and thickness is micron dimension；Metal floor layer thicknesses of layers be 200 nanometers and more than, prevent incidence wave from transmiting；In the upper surface of dielectric layer, its elementary cell has two kinds of groined type structure and three-back-shaped structure to the metal patch layer.Reflected phase is normalized in broad frequency band can cover 0~360 ° of angle.Whole array is formed by the unit random alignment of different reflected phases or by algorithm optimization.The present invention has the advantages that easily designed, easy to process, broadband, and scattering strength of the two-dimensional metallic objective body on back scattering Main way can be effectively reduced in broad frequency band.The present invention is single layer structure, can be processed making by standard photolithography techniques, there is important application prospect in Terahertz application.
Description
Technical field
The present invention relates to novel artificial Material Field, and in particular to a kind of Terahertz broadband random surface.
Background technology
Novel manual electromagnetic material is a kind of artificial composite structure, is arranged according to cycle or paracycle by some sub-wavelength units
Row composition, with the electromagnetic property not available for nature medium.Change electricity by changing cellular construction and its space arrangement
The electromagnetic property in space on electromagnetic wave propagation path, so as to control electromagnetic wave propagation.
The super surface of Novel manual electromagnetic material belongs to Novel manual electromagnetic material field, and feature is only to need very thin thickness just
The control to Electromagnetic Wave Propagation can be completed.
The content of the invention
Technical problem：It is an object of the invention to provide a kind of simple structure, it is easy to make, broadband can be effectively realized, greatly
The incident low scattering random surface of angular range.By the adjustment to basic cell structure dimensional parameters, realize to unit resonance
The fine setting of frequency, the reflected phase of incidence wave also accordingly changes.By the diverse location in array surface, different reflection phases are chosen
The unit of position, can allow whole array surface to be similar to irreflexive effect into one kind to incident waveform, allow energy to different sides
To reflection, so as to reduce the scattering energy on main scattering direction.
Technical scheme：To solve the above problems, a kind of Terahertz broadband random surface, including several tools have been invented herein
There is the unit battle array of different patch sizes, each unit battle array is made up of several identical resonant elements；The resonant element includes
Metal patch layer, dielectric layer and metal floor layer, the dielectric layer are located between metal patch layer and metal floor layer；It is described humorous
The unit that shakes has two kinds of structures：The first groined type cellular construction, is that the endless metal belt of groined type surrounds a foursquare metal
Piece；Second three-back-shaped cellular construction, is that the endless metal belt of square shape surrounds a foursquare sheet metal.
Further, the first groined type cellular construction：The unit cycle is a1=100 μm, thickness of dielectric layers is t=30 μ
M, the line width of groined type endless metal belt is d1=5 μm, the minor matters length of well word is b1, groined type endless metal belt and central metal side
Block at intervals of g1=5 μm；Second three-back-shaped cellular construction：The unit cycle is a2=100 μm, thickness of dielectric layers is t=30 μ
M, the line width of three-back-shaped endless metal belt is d2=5 μm, the length of side of central metal square is b2, three-back-shaped endless metal belt and center side
Block metal at intervals of g2=5 μm；The b1Value is from 5 μm to 20 μm, b2Value from 12 μm to 21 μm, by b1And b2In regulation
In the range of change value form the unit battle array that several sizes are not waited, the reflected phase of the unit battle array that several sizes are not waited
Excursion can cover 0~360 ° of scope after normalization.
Further, b1And b2The determination method of value：First by one two-dimensional random matrix of Software Create, two-dimensional random
The span of matrix unit is the integer value in 0 to 360, and the two-dimensional random matrix unit represents random surface each unit
The phase value of battle array；Then, using phase and size b1、b2Between numerical relation, by unit battle array phase two-dimensional random matrix
Obtain the dimension matrix of random surface unit battle array, i.e. b1、b2Value matrix.
Further, resonant element parameter is adjusted, controllable random surface is operated in other in addition to terahertz wave band
Frequency range.
Further, several have different patch sizes unit battle array composition array, and several units battle array arrangement
Mode is random alignment, or is optimized by particle cluster algorithm.Make the energy of back wave most equably to all directions
Reflection.
Further, the material of the dielectric layer is organic high molecular polymer dielectric material, and thickness is micron dimension.
Further, the material of the dielectric layer is polyimides.
Further, the thicknesses of layers of the metal floor layer is 200-250 nanometers.Electromagnetic wave is set to transmit.
Invention unit structure has groined type and three-back-shaped two kinds.Both units carry out reflection when physical dimension is finely tuned
Phase normalization can be completely covered 0~360 degree of excursion, such that it is able to perfect simulation nature to after 0~360 degree
Irreflexive situation in boundary, arbitrary direction is reflexed to by incidence wave.In order that the energy of back wave is most equably to each side
To reflection, the arrangement mode of different reflected phase unit battle arrays can be optimized using genetic algorithm in array.
Beneficial effect：Compared with prior art, advantage of the invention：
1st, the present invention makes simple, easy to process, it is contemplated that machining accuracy problem, employs two kinds of cellular constructions, makes anti-
Penetrate phase and 0~360 degree of excursion is completely covered.A Rotating fields are only used, conformal special objective of Denging can be further realized, while
Avoid the mismachining tolerance of sandwich construction.
2nd, the present invention has widened working band using multiple resonant structures, and the random arrangement of unit produces similar irreflexive
Effect, scatters wave interference cancellation, can significantly reduce back scattering in the case of bandwidth wider and mainly scatter on direction
Intensity, the environmental requirement of work is relatively low, adaptable.
3rd, the present invention can not only reduce the backscatter intensity of normal incidence electromagnetic wave, in electromagnetic wave with larger angle oblique incidence
When, still with significant inhibitory action.This feature causes that the present invention has more preferable stealthy effect, can better adapt to reality
Using.
Brief description of the drawings
The schematic diagram of Fig. 1 a random surfaces.Fig. 1 b are the schematic diagrames of groined type cellular construction.Fig. 1 c are three-back-shaped unit knots
The schematic diagram of structure.
Fig. 2 a groined types cellular constructions centre frequency reflected phase with well word minor matters length b1The curve of change.Figure
The three-back-shaped cellular constructions of 2b centre frequency reflected phase with central metal square side length b2The curve of change.Fig. 2 a shades
Part is limited by current technique, it is impossible to the size of processing, is replaced with the dash area of Fig. 2 b.
Fig. 3 a are in a1=100 μm, b1=8 μm, g1=5 μm, d1At=5 μm the reflection amplitudes and phase of groined type structure with
The change curve of frequency.Fig. 3 b are in a2=100 μm, b2=20 μm, g2=5 μm, d2The reflection amplitudes of three-back-shaped structure at=5 μm
With phase with frequency change curve.Current diagram when Fig. 3 c are groined type structure and three-back-shaped structure resonance.
Fig. 4 a groined types structure curves that reflected phase changes with frequency in incidence angles degree.The three-back-shaped structures of Fig. 4 b
The curve that reflected phase changes with frequency in incidence angles degree.
During Fig. 5 a incidence wave vertical incidence, the simulation result of reflectance factor.Ordinate is that 1 curve is with random surface etc.
The reflectance factor of the metal plate of size, curve of the ordinate close to 0 is the reflectance factor of random surface.Fig. 5 b incidence waves are vertical
When incident, the experimental result of reflectance factor.Ordinate is that 1 curve is reflection system with the metal plate of random surface equidimension
Number, curve of the ordinate close to 0 is the reflectance factor of metal structure.
Fig. 6 (a-c) incidence wave impinged perpendicularly on when on random surface, and random surface is respectively at 1,1.4 and 1.7THz
Three-dimensional scattering directional diagram.Fig. 6 (d-f) incidence wave is impinged perpendicularly on when on random surface, random surface respectively 1,1.4 Hes
In the scattering directional diagram of xoy planes during 1.7THz.Fig. 6 (g-i) incidence wave impinges perpendicularly on the metal with the size such as random surface
When on flat board, random surface scattering directional diagram respectively at 1,1.4 and 1.7THz.Fig. 6 (j-l) incidence wave impinge perpendicularly on
When on the metal plate of the sizes such as random surface, random surface is respectively at 1,1.4 and 1.7THz in the scattering direction of xoy planes
Figure.
Fig. 7 random surface sample object figures and work flow schematic diagram.
Fig. 8 contrasts metallic plate and random surface respectively at 20 °, 30 °, 40 °, 50 °, 60 °, 70 °, 80 ° of scattering amplitude with
The curve of frequency change.Fig. 8 a incidence waves angle is 20 °, and Fig. 8 b incidence waves angle is 30 °, and Fig. 8 c incidence waves angle is 40 °.
Specific embodiment
The present invention is described further below in conjunction with the accompanying drawings.
As shown in Figure 1a, a kind of Terahertz broadband random surface, including several have different patch sizes unit battle array,
Each unit battle array is made up of several shape identical resonant elements；The resonant element include metal patch layer, dielectric layer and
Metal floor layer, the dielectric layer is located between metal patch layer and metal floor layer；The resonant element has two kinds of structures：The
A kind of groined type cellular construction, is that the endless metal belt of groined type surrounds a foursquare sheet metal；Second three-back-shaped unit
Structure, is that the endless metal belt of square shape surrounds a foursquare sheet metal.
Fig. 1 b are the first groined type cellular constructions：The unit cycle is a1=100 μm, thickness of dielectric layers is t=30 μm, well
The line width of font endless metal belt is d1=5 μm, the minor matters length of well word is b1, groined type endless metal belt and central metal square
At intervals of g1=5 μm；Second three-back-shaped cellular construction of Fig. 1 c：The unit cycle is a2=100 μm, thickness of dielectric layers is t=30 μ
M, the line width of three-back-shaped endless metal belt is d2=5 μm, the length of side of central metal square is b2, three-back-shaped endless metal belt and center side
Block metal at intervals of g2=5 μm；The b1Value is from 5 μm to 20 μm, b2Value is from 12 μm to 21 μm.By b1And b2In regulation
In the range of change value form the unit battle array that several sizes are not waited, the reflected phase of the unit battle array that several sizes are not waited
Excursion can cover 0~360 ° of scope after normalization.Such that it is able to irreflexive in perfect simulation nature
Situation, arbitrary direction is reflexed to by incidence wave.In order that the energy of back wave most equably reflects to all directions, in array
The arrangement mode of different reflected phase unit battle arrays can be optimized using genetic algorithm.
Fig. 2 a groined types cellular constructions centre frequency reflected phase with well word minor matters length b1The curve of change.Figure
The three-back-shaped cellular constructions of 2b centre frequency reflected phase with central metal square side length b2The curve of change.Fig. 2 a shades
Part is limited by current technique, it is impossible to the size of processing, is replaced with the dash area of Fig. 2 b.Only use a Rotating fields, Ke Yijin
One step realizes conformal special objective of Denging, while avoiding the mismachining tolerance of sandwich construction.b1And b2The determination method of value：Lead to first
One two-dimensional random matrix of Software Create is crossed, the span of matrix unit is the integer value in 0 to 360, the two-dimensional random square
Array element represents the phase value of random surface each unit battle array；Then, as shown in Fig. 2 using phase and size b1、b2Between
Numerical relation, by unit battle array phase two-dimensional random matrix obtain random surface unit battle array dimension matrix.
Fig. 3 a are in a1=100 μm, b1=8 μm, g1=5 μm, d1At=5 μm the reflection amplitudes and phase of groined type structure with
The change curve of frequency.Fig. 3 b are in a2=100 μm, b2=20 μm, g2=5 μm, d2The reflection amplitudes of three-back-shaped structure at=5 μm
With phase with frequency change curve.Current diagram when Fig. 3 c are groined type structure and three-back-shaped structure resonance.From figure
It can be seen that the phase place change produced during range site resonance, adjustment unit size, it is possible to achieve 360 degree of changes of reflected phase
Change.
Fig. 4 a groined types structure curves that reflected phase changes with frequency in incidence angles degree.The three-back-shaped structures of Fig. 4 b
The curve that reflected phase changes with frequency in incidence angles degree.The reflected phase response of unit A and unit B is hardly entered
Firing angle degree influences, and illustrates that the Novel manual electromagnetic material random surface of design is insensitive to incident angle.
During Fig. 5 a incidence wave vertical incidence, the simulation result of reflectance factor.Ordinate is that 1 curve is with random surface etc.
The reflectance factor of the metal plate of size, curve of the ordinate close to 0 is the reflectance factor of random surface.Fig. 5 b incidence waves are vertical
When incident, the experimental result of reflectance factor.Ordinate is that 1 curve is reflection system with the metal plate of random surface equidimension
Number, curve of the ordinate close to 0 is the reflectance factor of metal structure.Contrast display random surface can substantially reduce normal incidence electromagnetism
The backscatter intensity of ripple.
Fig. 6 (a-c) incidence wave impinged perpendicularly on when on random surface, and random surface is respectively at 1,1.4 and 1.7THz
Three-dimensional scattering directional diagram.Fig. 6 (d-f) incidence wave is impinged perpendicularly on when on random surface, random surface respectively 1,1.4 Hes
In the scattering directional diagram of xoy planes during 1.7THz.Fig. 6 (g-i) incidence wave impinges perpendicularly on the metal with the size such as random surface
When on flat board, random surface scattering directional diagram respectively at 1,1.4 and 1.7THz.Fig. 6 (j-l) incidence wave impinge perpendicularly on
When on the metal plate of the sizes such as random surface, random surface is respectively at 1,1.4 and 1.7THz in the scattering direction of xoy planes
Figure.Contrast display, the present invention has widened working band using multiple resonant structures, and the random arrangement of unit produces similar diffusing reflection
Effect, scatter wave interference cancellation, back scattering can be significantly reduced in the case of bandwidth wider and mainly scattered on direction
Intensity, the environmental requirement of work is relatively low, adaptable.
Fig. 7 random surface sample object figures and work flow schematic diagram.The random surface includes metal patch layer, dielectric layer
With metal floor layer three-decker；Dielectric layer be located at metal patch layer and metal floor layer between, dielectric layer be polyimides or
Person other organic high molecular polymer dielectric materials, thickness is micron dimension；Metal floor layer is located at dielectric layer lower surface, film layer
Thickness be 200 nanometers and more than, electromagnetic wave is transmitted.
Fig. 8 contrasts metallic plate and random surface respectively at 20 °, 30 °, 40 °, 50 °, 60 °, 70 °, 80 ° of scattering amplitude with
The curve of frequency change.Fig. 8 a incidence waves angle is 20 °, and Fig. 8 b incidence waves angle is 30 °, and Fig. 8 c incidence waves angle is 40 °.It is right
It is of the invention when electromagnetic wave is with larger angle oblique incidence than display, still with significant inhibitory action.This feature causes that this is sent out
It is bright with more preferable stealthy effect, practical application can be better adapted to.
Combined the only limited number of embodiment of the present invention is described in detail out, it is readily understood that, this
Invention is not restricted in the disclosed embodiments.More, the present invention can change that merging is any amount of foregoing not to be referred to
The deformation arrived, change, replace or equivalent assemblies, but these match with the spirit and scope of the present invention.In addition, of the invention
Various embodiments are described out, it is to be understood that various aspects of the invention can only include the one of described embodiment
Part.Thus, the present invention is not limited by described above, but is only limited by the scope of attached claim.
Claims (6)
1. a kind of Terahertz broadband random surface, it is characterised in that：There is the unit battle array of different patch sizes including several, often
Individual unit battle array is made up of several identical resonant elements；The resonant element includes metal patch layer, dielectric layer and metal ground
Flaggy, the dielectric layer is located between metal patch layer and metal floor layer；The resonant element has two kinds of structures：The first well
Font cellular construction, is that the endless metal belt of groined type surrounds a foursquare sheet metal；Second three-back-shaped cellular construction, be
The endless metal belt of square shape surrounds a foursquare sheet metal；The first groined type cellular construction：The unit cycle is a1=100
μm, thickness of dielectric layers is t=30 μm, and the line width of groined type endless metal belt is d1=5 μm, the minor matters length of well word is b1, groined type
Endless metal belt is with central metal square at intervals of g1=5 μm；Second three-back-shaped cellular construction：The unit cycle is a2=100 μ
M, thickness of dielectric layers is t=30 μm, and the line width of three-back-shaped endless metal belt is d2=5 μm, the length of side of central metal square is b2, return
Font endless metal belt is with center square metal at intervals of g2=5 μm；The b1Value is from 5 μm to 20 μm, b2Value from 12 μm to
21 μm, by b1And b2Change value in prescribed limit forms the unit battle array that several sizes are not waited, several sizes
The excursion of reflected phase of unit battle array can cover 0~360 ° of scope after normalization；
Several have the unit battle array composition array of different patch sizes, and the arrangement mode of several units battle array is random row
Row, or optimized by particle cluster algorithm.
2. Terahertz broadband according to claim 1 random surface, it is characterised in that：b1And b2The determination method of value：First
By one two-dimensional random matrix of Software Create, the span of two-dimensional random matrix unit is the integer value in 0 to 360, should
Two-dimensional random matrix unit represents the phase value of random surface each unit battle array；Then, using phase and size b1、b2Between
Numerical relation, by unit battle array phase two-dimensional random matrix obtain random surface unit battle array dimension matrix.
3. Terahertz broadband according to claim 1 random surface, it is characterised in that：The material of the dielectric layer is organic
High molecular polymer dielectric material, thickness is micron dimension.
4. Terahertz broadband according to claim 1 random surface, it is characterised in that：Adjustment resonant element parameter, it is controllable
Random surface processed is operated in other frequency ranges in addition to terahertz wave band.
5. Terahertz broadband according to claim 1 random surface, it is characterised in that：The material of the dielectric layer is polyamides
Imines.
6. Terahertz broadband according to claim 1 random surface, it is characterised in that：The film layer of the metal floor layer is thick
Spend is 200-250 nanometers.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106129632B (en) * | 2016-06-03 | 2019-01-25 | 东南大学 | Bandwidth can careful design random surface |
| CN106356636A (en) * | 2016-08-24 | 2017-01-25 | 江苏赛博防务技术有限公司 | Transparent broadband random surface |
| CN107453050A (en) * | 2017-06-20 | 2017-12-08 | 南京航空航天大学 | Surpass the broadband lens on surface based on phase gradient |
| CN108336501B (en) * | 2018-01-23 | 2020-10-30 | 中国计量大学 | Reflected terahertz wave direction controller |
| CN108987934B (en) * | 2018-06-05 | 2021-04-27 | 中国传媒大学 | Ultra-wideband radar and super-material with reduced scattering cross section |
| CN109904623A (en) * | 2019-03-12 | 2019-06-18 | 东南大学 | A kind of broadband inhale wave, scattering is adjustable super surface |
| CN112103661B (en) * | 2020-09-18 | 2022-06-10 | 中国科学院半导体研究所 | Transparent flexible broadband microwave low-scattering structure and transparent flexible skin |
| CN114279998B (en) * | 2021-12-29 | 2024-01-09 | 福州大学 | Liquid enhancement sensing system and method based on quasi-Chinese character 'Hui' type terahertz metamaterial |
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